<?php

echo "<p>userName:</p>";
echo $_POST['input_text'];

echo "</br><a href='FORM.PHP'>back</a>";
$arg_userName= $_POST['input_text'];
$arg_pwd= $_POST['input_password'];
if(empty($arg_userName)){
    echo "<scrpit>alert('param not validate!') </scrpit>";
}
if(!ereg("[0-9a-zA-Z]+",$arg_userName)){
    echo "</br>userName property not vilible";
}
if(strlen($arg_userName)<=0){
    echo "</br>userName do not have enugh lenth!";
}
if(!file_exists('test.php')){
echo "</br>do not have php.php";
}
else{
    echo "</br>have test.php";
}
?>